Compost bin



FIG. 1 is a perspective view of a compost bin, showing our new design;

FIG. 2 is a front elevational view thereof, the rear being a mirror image;

FIG. 3 is a left side elevational view thereof, the right side being identical;

FIG. 4 is a top plan view thereof; and,

FIG. 5 is a bottom plan view thereof. 

The ornamental design for a compost bin, as shown and described. 